Beresford TC-7533 Bushmaster User manual

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TC-7533 Bushmaster Instruction Manual
Stereo Audio Digital-to-Analogue Converter
Overview
The TC-7533 Bushmaster is a reference-quality digital-to-analogue audio
converter featuring the latest DAC Audio technology, Direct Coupled output
stage, and Class-AB headphone stage. The Bushmaster is designed for
maximum transparency and critical playback in professional audiophile
applications.
Burn in
Many users report that the sound output develops in quality after a few days
of use. The Bushmaster can be left powered on and playing a music stream
with the volume turned down for a few days to speed up the burn in process.
Fixed Output Level connection
The Bushmaster Fixed Output is designed to connect to the CD or AUX
input of an amplifier.
Front Panel
Digital Inputs
Four digital input connectors (2 x coaxial and 2 x optical).
Input Status Display
Five LED’s on the front panel indicate which digital input is selected and
when the Bushmaster is in AUTO or MANUAL mode.
Select Switch
The Select switch allows you to select between AUTO input signal detect,
Manual input channel selection, and LED sleep mode.
Stereo Headphone Socket
The stereo headphone socket mutes the fixed RCA/PHONO output when a
headphone plug is inserted
Headphone Amplifier
The Bushmaster headphone output is driven by a high-end headphone
amplifier. It is designed to drive loads between 12 to 600 Ohms.
Volume Control
The front-panel Volume Control sets the output level of the headphone.
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Rear Panel
Digital Inputs
Four digital inputs, selected from the front-panel toggle switches.
The Bushmaster will not decode DSD, AC3, DTS, or ADAT signals.
176.4kHz sampling rate is not supported.
Input 1 – Optical
The optical input 1 is a TOSLINK connector.
Input 2 – Optical
The optical input 2 is a TOSLINK connector..
Input 3 - SPDIF
The coaxial input uses a RCA connector.
Input 4 – SPDIF
The coaxial input uses a RCA connector.
Analogue Output
The Bushmaster has a Left and Right Fixed Line output, terminated into a
pair of RCA/PHONO sockets.
The output is disconnected when a headphone is plugged into the
headphone socket. In this condition the Bushmaster can be used as a
headphone amplifier.
DC power supply socket
The supplied external AC-DC power supply is 12Volts. The Bushmaster can
however work with regulated power supplies up to 15Volts. The Bushmaster
also supports the use of 12V rechargeable batteries or battery packs.
The centre pin is the Positive power supply terminal.
A country specific AC-DC power cord is included with each Bushmaster
converter shipped to most countries. Plug adapters for less well known
configurations are otherwise available locally.
The Bushmaster can operate from as little as 200mA, and withstand
external DC power drop out conditions for up to 2 seconds..
Ground Terminal
The Bushmaster has a ground terminal. This should be used for connection
to your amplifier if you are experiencing ground loop problems.
Important Specification Notes
The audio output on the RCA/PHONO socket is fixed. So it cannot be
adjusted with the volume control.
There is no USB input socket
Playback of 176.4kHz is not supported
The first 3mm of travel of the volume control is used to bias the headphone
amplifier circuit. So some differences in channel balance might be
noticeable within that space.

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Installation
1. Connect the DC plug from the Bushmaster power supply to the DC socket
on the DAC.
2. Connect the power cord figure of 8 end to the Bushmaster power supply.
3. Connect the DAC input sockets to your audio and video equipment with
suitable optical or digital coaxial cables. See our website for our own list of
suitable cables and conversion adapters.
4. Connect the DAC FIXED stereo output via RCA/PHONO cables to the
CD or AUX input of your amplifier via stereo RCA/PHONO cables of a
suitable length.
5. Plug the mains plug end of the Bushmaster power supply power cord into
a mains socket.
6. Press the Power button to switch ON the DAC.
NOTICE:
1. The Bushmaster does not have a variable RCA/PHONO
output. It should therefore not be used as a preamplifier
for a power amplifier.
2. Switch the Bushmaster On before your amplifier, and
switch your amplifier OFF before the Bushmaster. This
is to prevent the switch off signal pulse from the
Bushmaster passing to your speakers.
AUTOMODE
1. Switch the DAC OFF via the front panel Power button.
2. Wait at least ten seconds.
3. Switch the DAC back ON via the Power button.
4. Whilst the LEDs are each lighting up one by one, press and hold
down the SELECT button.
5. When all the LEDs are lit up, let go of the SELECT button.
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The STATUS LED will light up, and the DAC will scan each input one by one
till it finds a valid audio signal. The STATUS LED and the operating input
LED will now both light up.
When the input signal is removed, or the external equipment plugged into
that input is switched OFF, the DAC will start to scan the inputs again till it
finds a new valid input signal.
IMPORTANT:
The Auto function won’t operate with incoming digital signals that do not
switch OFF when no audio is present. Examples of this are some satellite
and cable boxes. In those cases you have to use the Manual Select
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MANUAL MODE
If the STATUS LED is lit and the DAC is either scanning for a new input
signal or playing music, you can switch to manual mode by pressing the
SELECT button once. When switching from AUTO to MANUAL MODE the
DAC will switch over to the TOSLINK-1 input. If you keep pressing and

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releasing the SELECT button, the DAC will switch from TOLSINK-1 to
TOSLINK-2, and then Coax-1 to Coax-2.
IMPORTANT:
Please note that the SELECT button has a delay to prevent accidental
operation of the DAC input select function. So observe at least two seconds
in between pressing the SELECT button.
SLEEPMODE
If you keep the Select button depressed , the input selector will activate the
SLEEP MODE function.
I SLEEP MODE each LED will be off when a valid audio stream is detected.
The selected input LED will light up again if no audio is detected.
ProgramBackup
When you switch the DAC OFF your settings will be saved. So next time you
switch the DAC back ON your DAC will start using your saved settings.
RESET MODE
The DAC’s operating system might get confused on occasions and refuse to
operate correctly when the SELECT button is pressed. If that happens you
can try to reboot the MCU (Micro Control Unit) and restore the DAC to the
factory default mode.
To reset the DAC:
6. Switch the DAC OFF via the Power button.
7. Wait at least ten seconds.
8. Switch the DAC back ON via the Power button.
9. Whilst the LEDs are each lighting up one by one, press and hold
down the SELECT button.
10. When all the LEDs are lit up, let go of the SELECT button.
The DAC’s operating system is now reset and any previous error condition
should now be cleared.
Note that this function is the same as the AUTO select function.
Fuse Holder
The fuse holder is inside the case close to the DC power connector socket.
The fuse rating is 2 Amps.
Safety Information
The factory supplied AC/DC adapter is suitable for 90 to 270 Volts AC
operation.
Repairs
Do not service or repair this product unless properly qualified.
Fuses
For continued fire hazard protection always replace the internal fuse with
the correct size and type.
Modifications
Do not substitute parts or make any modifications that may create safety
hazards and void the warranty.

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Notes on Warranty Repairs
An RN (Returns Number) is required when sending products back. Goods
for repair must be shipped to Beresford ME prepaid and preferably in their
original shipping carton with the RN clearly visible on the exterior of the
packaging. A note should be included giving detailed reasons for the return.